Energy 2
12
Energy Energy transfers
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Transcript of Energy 2
EnergyEnergy transfers
Match each of these to the type of energy that it containsA mug of coffeeA piece of coalA coiled springA moving bicycle Heat energy
Chemical energy
Elastic energy
Kinetic energy
Energy transfersEnergy can be changed from one form to
anotherExample:
A candle contains chemical energyWhen the candle burns the chemical energy is
transferred into…These changes can be represented by energy
flow diagramsChemical energy heat energy +
light energy
electrical
light
sound
heat
Energy transfersWhat are the energy transfers for a TV?
chemical
kinetic
sound
heat
What are the main energy transfers for a car engine?
Energy transfers
electrical
sound
heat
What are the main energy transfers for a radio?
Energy transfers
Energy transfers
A microphone changes ________ energyto __________ energy.
A photosynthesizing plant changes ______ energy to ___________ energy.
A skydiver falling changes ___________ ____________ to ___________ energy
A hair dryer changes __________ energy to __________ energy, ________ energy and ______ energy
The Sun changes __________ energy to ________ energy and _______ energy.
When a catapult is released it changes ________ energy to ______________ ___________ energy and __________ energy.
Conservation of energy
“Energy cannot be created or destroyed. It can only be changed from one form to another.”
What happens to the total energy of a system before and after and energy transfer? It remains the same but exists in different forms
electrical
light
sound
heat
The amount of electrical energy which is inputted equals the total amount of energy outputted
The law of conservation of energy
Energy can be transferred in more than one form at a time.
The INPUT energy will always equal the total OUTPUT energy.
“Energy cannot be created or destroyed. It can only be changed from one form to another.”
Electrical energy100%
Heat energy
20%(wasted)
Kinetic energy
22%(Wasted
vibration of the drill)
Kinetic energy
58%(Useful
spinning of the drill bit)
Energy Transfer Values
